Reagent selection for recovery of nickel and cobalt from nitric acid nickel laterite leach solutions by solvent extraction
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© 2015 Elsevier Ltd. All rights reserved.There is currently no commercial process for recovery of nickel and cobalt from a nitrate-based laterite leach liquor via solvent extraction. Such a process is becoming of interest as nitric acid leaching of nickel laterite ores is progressed by Direct Nickel. Although commercially proven solvent extraction processes do exist for nickel and cobalt extraction from sulphate-based laterite leach liquors, little is known regarding their application to nitrate-based liquors. In the present paper three different solvent extraction systems are compared from a commercialisation standpoint in order to inform future process development. These systems were: neodecanoic acid (Versatic™10)/tributylphosphate (TBP), Versatic 10/pyridine carboxylate (PC), and an aliphatic hydroxyoxime based extractant (LIX®63)/Versatic 10/PC. On the basis of acceptable separation of nickel and cobalt from manganese and magnesium, and ease of metal stripping, the synergistic combination of Versatic 10 and a pyridine carboxylate (in this case nonyl-4-PC) was identified as the most promising system for application to a nitrate-based laterite leach liquor.
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Hutton-Ashkenny, M.; Barnard, K.; Ibana, Don (2016)Direct solvent extraction of nickel and cobalt from nitrate-based leach liquors has become of interest due to the successful piloting of nitric acid processes for treating nickel laterite ores. The current study investigated ...
The use of pyridine derivatives as accelerators in the solvent extraction of nickel from a nitrate matrix by LIX®63/Versatic™10Hutton-Ashkenny, M.; Barnard, K.; Ibana, Don (2015)Direct solvent extraction (DSX) for the purification of nickel and cobalt from laterite leach liquors is an attractive alternative to precipitation of an intermediate product. With commercialisation of the Direct Nickel ...
The solvent extraction behaviour of chromium with Bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex [R] 272)Lanagan, Matthew D. (2003)The bulk of the world's known nickel reserves are contained in laterite ores but sulphidic ores remain the main source of the Western world's nickel production. With the continuing increase in nickel consumption and the ...